Re: gnu-make.m4 on NetBSD

[Bruno Haible]

Reuben Thomas wrote:
> Thanks for the change, which sounds good to me unless there's some other
> GPL-licensed version of make (so it might mention "GNU General Public
> License" in the output); it might be better explicitly to check the first
> line of the output?

Indeed. Also, better minimize the risk brought in by translations. So,
here's what I'm pushing:


2018-10-30  Bruno Haible  <address@hidden>

        gnu-make: Fix for NetBSD 8 'make'.
        Reported by Reuben Thomas in
        <https://lists.gnu.org/archive/html/bug-gnulib/2018-10/msg00135.html>.
        * m4/gnu-make.m4 (gl_GNU_MAKE): Use a heuristic based on the --version
        output, ignoring exit codes.

diff --git a/m4/gnu-make.m4 b/m4/gnu-make.m4
index 1f833d9..507dad6 100644
--- a/m4/gnu-make.m4
+++ b/m4/gnu-make.m4
@@ -10,10 +10,8 @@
 
 # Set GNU_MAKE if we are using a recent-enough version of GNU make.
 
-# Use --version AND trailing junk, because SGI Make doesn't fail on --version.
-
 AC_DEFUN([gl_GNU_MAKE],
 [
   AM_CONDITIONAL([GNU_MAKE],
-    [${MAKE-make} --version /cannot/make/this >/dev/null 2>&1])
+    [LC_ALL=C ${MAKE-make} --version 2>/dev/null | sed -e '2,$d' | grep GNU 
>/dev/null])
 ])